# Stats

A two-tailed test is conducted at the 5% significance level. What is the right tail percentile required to reject the null hypothesis?

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2. 👎
3. 👁
1. 97.5

(Left tail would be 2.5)

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2. 👎
2. In the past, the mean running time for a certain type of flashlight battery has been 8.0 hours. The manufacturer has introduced a change in the production method and wants to perform a hypothesis test to determine whether the mean running time has increased as a result. The hypotheses are:

1. 👍
2. 👎

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